Add GN targets for codesighs and telemetry

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 674295487db6989269a8fd3df9529ce430bdeda8..a392f27dc4227a9843c26e47ac9be8e6d103dc2a 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -8,6 +8,7 @@
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
+import("//build/config/features.gni")
 import("//build/config/ui.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
@@ -83,6 +84,7 @@ group("root") {
     "//third_party/cacheinvalidation",
     "//third_party/cld",
     "//third_party/cld_2",
+    "//third_party/codesighs",
     "//third_party/ffmpeg",
     "//third_party/flac",
     "//third_party/harfbuzz-ng",
@@ -118,6 +120,7 @@ group("root") {
     "//third_party:jpeg",
     "//tools/gn",
     "//tools/imagediff($host_toolchain)",
+    "//tools/telemetry:bitmaptools",
     "//ui/accessibility",
     "//ui/app_list",
     "//ui/aura",
@@ -141,6 +144,10 @@ group("root") {
   ]
   deps += root_extra_deps
 
+  if (enable_extensions) {
+    deps += [ "//extensions/shell:app_shell_unittests" ]
+  }
+
   if (!is_win) {
     deps += [ "//breakpad:symupload" ]
   }